STIH)
STIHL MS 290, 310, 390
2004-11
Contents
1.
Introduction
2
2.
Safety Precautions
3
3.
Specifications
4
3.1 3.1.1 3.2 3.3 3.4 3.5
Engine Engine (USA only) Fuel System Ignition System Chain Lubrication Tightening Torques
4 4 5 5 5 6
6.5 6.5.1 6.5.2 6.6 6.7
30 31 33 35 35
7.
Ignition System
36
7.1 7.1.1 7.1.2
Ignition Module Ignition Timing Removing and Installing Testing the Ignition Module Spark Plug Boot Ignition Lead Flywheel Contact Spring Replacing Wiring Harness Ignition System Troubleshooting
37 37
7.1.3 4. 4.1 4.2 4.3 4.4 4.5 4.6 5.
5.1 5.2 5.3 5.4 5.5 5.6 5.6.1 5.6.2 5.7 5.7.1 5.7.2 5.8
Troubleshooting Chart Clutch, Chain Drive, Chain Brake, Chain Tensioner Rewind Starter Chain Lubrication Ignition System Carburetor Engine Clutch, Chain Drive, Chain Brake and Chain Tensioner Clutch Drum/Chain Sprocket Chain Catcher Spiked Bumper Collar Stud Clutch Chain Brake Checking Operation Removing and Installing Replacing Pins Removing Installing Chain Tensioner
6.
Engine
6.1
Muffler/Spark Arresting Screen Leakage Test Preparations Pressure Test Vacuum Test Oil Seals Shroud
6.2 6.2.1 6.2.2 6.2.3 6.3 6.4
7
7 8 9 10 11 13
14 14 15 15 16 16 18 18
7.2 7.2.1 7.3 7.4 7.5 7.6
23
43 45 48
8.1 8.2
General Removing and Installing Pawl Rope Rotor Starter Rope/Grip Tensioning Starter Rope Guide Bushing Replacing Rewind Spring
48
8.7
9.1 9.2 9.3 9.3.1 9.3.2 9.3.3
23 25 25 26 26 27 29
39 40 41 42 43
Rewind Starter
8.3 8.4 8.5 8.5.1 8.6
9.4 9.5
AV Handle System/ Handle Housing Front Handle Handle Housing Annular Buffers Front Handle/ Handle Housing Handle Housing/ Engine Housing Front Handle/Engine Housing Switch Shaft Throttle Trigger/ Interlock Lever
Chain Lubrication
60
10.1
Pickup Body/ Suction Hose 10.2 Valve 10.3 Tank Cap 10.4 Oil Pump 10.4.1 Removing and Installing 10.4.2 Servicing
62 63
11.
Fuel System
64
11.1 Air Filter 11.2 Carburetor 11.2.1 Removing and Installing 11.2.2 Leakage Test 11.3 Servicing the Carburetor 11.3.1 Metering Diaphragm 11.3.2 Inlet Needle 11.3.3 Fixed Jet 11.3.4 Pump Diaphragm 11.4 Adjusting Carburetor 11.4.1 User Adjustment (Carburetor without Limiter Caps) 11.4.2 User Adjustment (Carburetor with Limiter Caps) 11.4.3 Basic Setting (Carburetor with Limiter Caps) 11.5 Tank Vent 11.5.1 Machines up to 2002 11.5.2 Machines from 2002 11.6 Fuel Tank 11.6.1 Pickup Body 11.6.2 Suction Hose 11.6.3 Tank Cap 11.6.4 Replacing Engine Housing
64 65
60 61 62 62
37
8.
9. 18 21 21 22 23
10.
Removing and Installing the Engine Cylinder Piston Piston Rings Crankshaft
48 48 49 49 51 52 52
53 53 54 56
12.
65 66 67 67 68 69 69 71 71 72 73 74 74 75 76 76 76 77 77
Special Servicing Tools
79
Servicing Aids
81
56 56
13.
57 58 59
q Š ANDREAS STIHL AG & Co. KG, 2004
MS 290, MS 310, MS 390
1
1.
Introduction
This service manual contains detailed descriptions of all the typical repair and servicing procedures for this power tool. As the design concept of models MS 290, MS 310 and MS 390 is almost identical, the descriptions and servicing procedures in this manual generally apply to all three models. Differences are described in detail.
The special tools mentioned in the descriptions are listed in chapter "Special Servicing Tools" of this manual. Use the part numbers to identify the tools in the "STIHL Special Tools" manual which lists all the special servicing tools currently available from STIHL. Symbols are included in the text and pictures for greater clarity. The meanings are as follows:
You should make use of the illustrated parts lists while carrying out repair work. They show the installed positions of the individual components and assemblies.
In the descriptions:
Refer to the latest edition of the relevant parts list to check the part numbers of any replacement parts.
: = Action to be taken that is not shown in the illustration (above the text)
A fault on the machine may have several causes. To help locate the fault, consult the chapter on "Troubleshooting" and the "STIHL Service Training System".
In the illustrations:
Refer to the “Technical Information� bulletins for engineering changes which have been introduced since publication of this service manual. Technical information bulletins also supplement the parts list until an updated edition is issued.
2
: = Action to be taken as shown in the illustration (above the text)
Servicing and repairs are made considerably easier if the clamp (1) 5910 890 2000 is used to mount the machine on assembly stand (2) 5910 890 3100 so that one clamp screw engages the outer 10 mm hole (3) in the assembly stand. To service the underside of the machine, turn it upside down and mount it so that one clamp screw engages the inner 10 mm hole in the assembly stand.
Pointer (short arrow) Direction of movement (long arrow) b 4.2 = Reference to another chapter, i.e. chapter 4.2 in this example. Service manuals and technical information bulletins are intended exclusively for the use of properly equipped repair shops. They must not be passed to third parties.
Note: Pull the hand guard back against the front handle for this purpose. Always use original STIHL replacement parts. They can be identified by the STIHL part number, the STIH) logo and the STIHL parts symbol ( This symbol may appear alone on small parts.
MS 290, MS 310, MS 390
2.
Safety Precautions
If the engine is started up in the course of repairs or maintenance work, observe all local and countryspecific safety regulations as well as the safety precautions and warnings in the instruction manual. Gasoline is an extremely flammable fuel and can be explosive in certain conditions. Improper handling may result in burns or other serious injuries. Warning! Do not bring any fire, flame, spark or other source of heat near the fuel. All work with fuel must be performed outdoors only. Spilled fuel must be wiped away immediately.
MS 290, MS 310, MS 390
3
3.
3.1
Specifications
Engine
Displacement: Bore: Stroke: Engine power to ISO 7293: Max. permissible engine speed with bar and chain: Idle speed: Clutch: Clutch engages at: Crankcase leakage test at gauge pressure: under vacuum:
3.1.1
MS 310
MS 390
56.5 cm3 46 mm 34 mm 3.0 kW (4.1 bhp) at 9,500 rpm
59.0 cm3 47 mm 34 mm 3.2 kW (4.4 bhp) at 9,500 rpm
64.1 cm3 49 mm 34 mm 3.4 kW (4.6 bhp) at 9,500 rpm
12,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm
13,000 rpm
0.5 bar 0.5 bar
Engine (USA only)
Displacement: Bore: Stroke: Engine power to ISO 7293: Max. permissible engine speed with bar and chain: Idle speed: Clutch: Clutch engages at: Engine leakage test at gauge pressure: under vacuum:
4
MS 290
MS 290
MS 310
MS 390
3.44 cu. in 1.81 in 1.33 in 2.8 kW (3.8 bhp) at 9,500 rpm
3.6 cu. in 1.85 in 1.33 in 3.0 kW (4.1 bhp) at 9,500 rpm
3.91 cu. in 1.92 in 1.33 in 3.2 kW (4.4 bhp) at 9,500 rpm
12,500 rpm 13,000 rpm 2,800 rpm Centrifugal clutch without linings 3,500 rpm
13,000 rpm
7.25 psi 7.25 psi
MS 290, MS 310, MS 390
3.2
Fuel System Carburetor leakage test at gauge pressure: Operation of tank vent at gauge pressure: Fuel:
3.3
0.3 bar (4.35 psi) as specified in instruction manual
Ignition System Air gap between ignition module and fanwheel: Spark plug (suppressed): Electrode gap:
3.4
0.8 bar (11.60 psi)
0.15 – 0.3 mm Bosch WSR 6F NGK BPMR 7 A 0.5 mm
Chain Lubrication Fully automatic, speed-controlled oil pump with rotary piston Oil delivery rate:
MS 290, MS 310, MS 390
8 – 18 cm3 at 10,000 rpm
5
3.5
Tightening Torques
DG screws are used in polymer and light metal components. These screws form a permanent thread when they are installed for the first time. They can be removed and installed as often as necessary without impairing the strength of the screwed assembly, providing the specified tightening torque is observed. For this reason it is essential to use a torque wrench.
Fastener
Thread size
For component
Screw
DG4x15
Cover, chain tensioner/engine housing
Collar screw Collar screw Screw Screw Screw Screw Screw Slotted screw Screw Screw Screw Screw Carrier Screw Screw Screw Locknut
DG8x24 M10x21 DG4x15 DG4x15 DG5x24 DG5x24 DG4x15 M5 DG5x16 DG5x16 DG5x24 DG4x15 M12x1L DG6x52 DG5x24 DG5x24 M5
Guide bar Collar screw for guide bar/engine pan Chain brake cover/engine housing Handle housing/handle molding Handlebar/handle housing Hand guard, left Shroud/engine housing Box filter/carburetor Chain catcher/engine housing Spiked bumper/engine housing Fan housing/engine housing Ground connection to cylinder Carrier/crankshaft Engine housing/cylinder Annular buffer/handlebar Annular buffer/engine housing Muffler cover/cylinder/screw
Nut Nut Spark plug Screw Screw
M8x1 M5 M14x1.25 DG5x24 DG4x15
Flywheel/crankshaft Carburetor/handle housing/screw Spark plug Ignition module/engine housing Oil pump
Torque kpm
Nm
0.25 1.6 3.0 0.25 0.16 0.35 0.35 0.25 0.2 0.35 0.35 0.35 0.4 5.0 1.1 0.35 0.35
2.5 16.0 30.0 2.5 1.6 3.5 3.5 2.5 2.0 3.5 3.5 3.5 4.0 50.0 11.0 3.5 3.5
0.8 2.8 0.33 2.5 0.48 0.4
8.0 28.0 3.3 25.0 4.8 4.0
Remarks
1)
2)
Remarks: 1) Loctite 243, medium strength 2) with sleeve
6
MS 290, MS 310, MS 390
4. 4.1
Troubleshooting Chart Clutch, Chain Drive, Chain Brake, Chain Tensioner
Condition
Cause
Remedy
Saw chain stops under load at full throttle
Clutch shoes badly worn
Install new clutch
Clutch drum badly worn
Install new clutch drum
Brake band stuck
Check freedom of movement and function of brake band
Engine idle speed too high
Readjust with idle speed screw (LA) (counterclockwise)
Saw chain rotates at idle speed
Clutch springs stretched or fatigued Replace the clutch springs, or clutch if necessary Clutch spring hooks broken Loud noises
Chain sprocket wears rapidly
Chain does not stop immediately when brake is activated
MS 290, MS 310, MS 390
Replace the clutch springs
Clutch springs stretched or fatigued Replace all clutch springs Needle cage damaged
Fit new needle cage
Clutch shoe retainer broken
Fit new retainer
Clutch shoes and carrier worn
Install new clutch
Chain not properly tensioned
Tension chain as specified
Wrong chain pitch
Fit chain of correct pitch
Insufficient chain lubrication
Check chain lubrication
Chain sprocket worn
Install new chain sprocket
Brake spring stretched or broken
Fit new brake spring
Brake band stretched / worn / broken
Fit new brake band
Clutch drum worn
Install new clutch drum
7
4.2
Rewind Starter
Condition
Cause
Remedy
Starter rope broken
Rope pulled out too vigorously as far as stop or over edge, i.e. not vertically
Fit new starter rope
Normal wear
Fit new starter rope
Rewind spring broken
Fit new rewind spring
Spring overtensioned – no reserve when rope is fully extended
Fit new rewind spring
Very dirty or corroded
Clean or replace rewind spring
Guide peg on pawls or pawls themselves are worn
Fit new pawls
Spring clip fatigued
Fit new spring clip
Starter mechanism is very dirty
Clean complete starter mechanism
Lubricating oil on rewind spring becomes viscous at very low outside temperatures (spring windings stick together)
Coat rewind spring with a standard solvent-based degreasant (containing no chlorinated or halogenated hydrocarbons). Then pull rope carefully several times until normal action is restored
Starter rope does not rewind
Starter rope can be pulled out almost without resistance (crankshaft does not turn)
Starter rope is difficult to pull and rewinds very slowly
8
MS 290, MS 310, MS 390
4.4
Ignition System
Warning! Exercise extreme caution while carrying out maintenance and repair work on the ignition system. The high voltages which occur can cause serious or fatal accidents!
Condition
Cause
Remedy
Engine runs roughly, misfires, temporary loss of power
Spark plug boot is loose
Press boot firmly onto spark plug and fit new spring if necessary
Spark plug sooted, smeared with oil
Clean the spark plug or replace if necessary
Incorrect air gap between ignition coil and flywheel
Set air gap correctly
Flywheel cracked or has other damage or pole shoes have turned blue
Install new flywheel
Ignition timing wrong, flywheel out of adjustment, key in flywheel has sheared off
Install new flywheel
Weak magnetization in flywheel – pole shoes have turned blue
Install new flywheel
No ignition spark
Check operation of Master Control lever and ignition module
No ignition spark
Faulty insulation on ignition lead or short circuit wire. Use ohmmeter to check ignition lead for break. If break is detected or high resistance measured, fit a new ignition lead
Check operation of spark plug. Inspect Master Control lever, ignition coil/lead for damage insulation and leakage current.
Clean or replace spark plug, replace faulty parts of ignition system
Engine pan damaged (cracks)
Replace engine pan
10
MS 290, MS 310, MS 390
4.5
Carburetor
Condition
Cause
Remedy
Carburetor floods; engine stalls
Inlet needle not sealing. Foreign matter in valve seat or cone damaged
Remove and clean or replace the inlet needle, clean the fuel tank, pickup body and fuel line if necessary
Inlet control lever sticking on spindle
Free off inlet control lever
Helical spring not located on nipple of inlet control lever
Remove the inlet control lever and refit it correctly
Perforated disc on diaphragm is deformed and presses constantly against the inlet control lever
Fit a new metering diaphragm
Inlet control lever too high (relative to correct installed position)
Set inlet control lever flush with top edge of housing
Idle jet too lean
Rotate low speed screw (L) counterclockwise (richer), no further than stop
Main jet too lean
Rotate high speed screw (H) counterclockwise (richer), no further than stop
Inlet control lever too low (relative to correct installed position)
Set inlet control lever flush with top edge of housing
Inlet needle sticking to valve seat
Remove inlet needle, clean and refit
Diaphragm gasket leaking
Fit new diaphragm gasket
Metering diaphragm damaged or shrunk
Fit new metering diaphragm
Impulse hose damaged or kinked
Fit new impulse hose
Poor acceleration
MS 290, MS 310, MS 390
11
Condition
Cause
Remedy
Engine will not idle, idle speed too high
Throttle shutter opened too wide by idle speed screw (LA)
Reset idle speed screw (LA) correctly
Engine leaking
Seal the engine
Idle jet bores or ports blocked
Clean jet bores and ports and blow clear with compressed air
Idle jet too rich or too lean
Set low speed screw (L) correctly
Setting of idle speed (LA) incorrect – throttle shutter completely closed
Set idle speed screw (LA) correctly
Small plastic plate in valve jet does not close
Clean or renew valve jet
Air filter dirty
Clean the air filter
Throttle shutter not opened fully
Check linkage
Tank vent faulty
Clean tank vent or replace if necessary
Fuel pickup body dirty
Clean the pickup body, fit a new filter
Fuel strainers dirty
Replace the fuel strainers
Leak in fuel line between tank and fuel pump
Seal connections or install a new fuel line
Setting of high speed screw (H) too rich
Rotate high speed screw (H) clockwise (leaner), no further than stop
Main jet bores or ports blocked
Clean the carburetor
Pump diaphragm damaged or fatigued
Fit new pump diaphragm
Engine stalls at idle speed
Engine speed drops quickly under load – low power
12
MS 290, MS 310, MS 390
4.6
Engine
Always check and, if necessary, repair the following parts before looking for faults on the engine: – – – –
Air filter Fuel system Carburetor Ignition system
Condition
Cause
Remedy
Engine does not start easily, stalls at idle speed, but operates normally at full throttle
Manifold leaking
Seal or replace the manifold
Oil seals on crankshaft damaged
Replace the oil seals
Joint between cylinder and engine pan leaking or damaged (cracks)
Seal or replace engine pan
Piston rings worn or broken
Fit new piston rings
Muffler / spark arresting screen (if fitted) carbonized
Clean the muffler (inlet and exhaust), replace spark arresting screen, replace muffler if necessary
Air filter element dirty
Replace air filter element
Fuel / impulse line severely kinked or damaged
Replace lines or position them free from kinks
Insufficient cylinder cooling. Air inlets in fan housing blocked or cooling fins on cylinder very dirty
Thoroughly clean all cooling air openings and the cylinder fins
Engine does not deliver full power or runs erratically
Engine overheating
MS 290, MS 310, MS 390
13
5. 5.1
Clutch, Chain Drive, Chain Brake and Chain Tensioner Clutch Drum/Chain Sprocket
209RA000 VA
143RA007 VA
If there are signs of serious wear on the inside diameter of the clutch drum (1), check the remaining wall thickness. If it is less than about 80% of the original thickness, fit a new clutch drum. If the clutch drum has to be replaced, also check the brake band, b 5.6.2
: Remove the needle cage.
– Remove the chain sprocket cover.
– Clean the clutch drum/chain sprocket with standard solventbased degreasant containing no chlorinated or halogenated hydrocarbons, b 13.
: Disengage the chain brake by pulling the hand guard towards the front handle.
209RA001 VA
2
176RA330 VA
1
: If the clutch drum/chain sprocket is still serviceable, use No. 120 emery paper or emery cloth (grain size approx. 120 µm) to clean and roughen its friction surface.
: Remove the E-clip (1). : Remove the washer (2).
Install in the reverse sequence.
– If a rim sprocket is fitted, pull it off. : Remove the clutch drum/chain sprocket.
14
100% 80%
!
148RA101 VA
209RA002 VA
1
– Clean crankshaft stub with standard solvent-based degreasant containing no chlorinated or halogenated hydrocarbons. Wash needle cage and lubricate with grease, b 13. – Replace damaged needle cage.
: Inspect the clutch drum (1) for signs of wear.
MS 290, MS 310, MS 390
5.2
Chain Catcher
5.3
Spiked Bumper
– Rotate clutch drum/chain sprocket and apply slight pressure at the same time until the oil pump drive spring engages the notch.
2
209RA193 VA
Install all other parts in the reverse sequence.
1
1 209RA003 VA
– Fit rim sprocket with the cavities facing outwards.
– Remove the chain sprocket cover, bar and chain.
– Remove the chain sprocket cover, bar and chain.
: Take out the screw (1).
– Take out the screws (arrows).
: Remove the chain catcher (2).
: Remove the spiked bumper (1).
Install in the reverse sequence.
Install in the reverse sequence.
Check correct installed position.
MS 290, MS 310, MS 390
15
5.4
Collar Stud
5.5
1
– Install the collar stud with the M 8 stud puller, b 12. – Tighten down the collar stud firmly, b 3.5
– Troubleshooting – b 4.1 – Remove the clutch drum/chain sprocket, b 5.1 – Remove the prefilter, b 11.1
209RA099 VA
Install all other parts in the reverse sequence.
Clutch
– Remove the chain sprocket cover with cutting attachment. : Use M 8 stud puller 5910 893 0501, b 12, to remove the collar stud (1).
1
2
If the thread in the engine housing is badly damaged or stripped, it will not be possible to secure the standard collar stud (1) properly. This situation can be remedied by using the DG 9 collar stud 1127 664 2410 (2).
209RA004 VA
209RA202 VA
1
: remove the spark plug boot (1). – Unscrew the spark plug.
Do not drill out the mounting bore in the engine housing. – Coat thread of the DG 9 collar stud with Loctite 648, b 13.
1
209RA005 VA
– Install the collar stud squarely.
: Push the locking strip (1) 0000 893 5903 into the spark plug hole so that "TOP" faces up.
16
MS 290, MS 310, MS 390
: Unscrew the clutch from the crankshaft in the direction of the arrow (left-hand thread).
146RA206 VA
209RA007 VA
209RA006 VA
f
: Carefully clamp the clutch in a vise.
: Pull the retainers off the clutch shoes.
2
1
146RA207 VA
– Clean all parts in a little standard solvent-based degreasant containing no chlorinated or halogenated hydrocarbons, b 13.
: Attach one end of each spring (1) to the clutch shoes.
209RA009 VA
208RA026 VA
1
: Take the cover washer (1) (where fitted) off the crankshaft.
– Replace any damaged parts.
1
: Use the hook (2) 5910 890 2800 to attach other ends of springs and press them firmly into the clutch shoes.
Install in the reverse sequence.
2
146RA205 VA
Important: Clutches marked 1125/01 an the carrier must be installed without cover washer. Clutches marked 1127/00 on the carrier must be installed with cover washer.
: Use hook (2) 5910 890 2800 to remove the clutch springs (1). – Pull the clutch shoes off the carrier.
MS 290, MS 310, MS 390
17
5.6 5.6.1
TOP
209RA010 VA
1
: Push cover washer (1), "TOP" (arrow) facing outward, onto the crankshaft.
Chain Brake Checking Operation
The chain brake is one of the most important safety devices on the chainsaw. Its efficiency is measured in terms of the chain braking time, i.e. the time that elapses between activating the brake and the saw chain coming to a complete standstill. The shorter the braking time, the better the efficiency and protection offered against being injured by the rotating chain. Contamination (with chain oil, chips, fine particles of abrasion, etc.) and smoothing of the friction surfaces of the brake band and clutch drum impair the coefficient of friction. This, in turn, reduces the frictional forces and thus prolongs the braking time. A fatigued or stretched brake spring has the same negative effect.
5.6.2
Removing and Installing
– Remove the clutch drum/chain sprocket, b 5.1 – Relieve tension of brake spring by pushing hand guard forward.
2
1
: Screw on the clutch and tighten it down firmly, b 3.5 Install all other parts in the reverse sequence.
– With the chain brake released, open the throttle wide and activate the brake manually – the chain must come to an abrupt stop.
250RA008 VA
The braking time is in order if deceleration of the saw chain is imperceptible to the eye.
: If terminal of spark plug has a detachable adapter nut, make sure it is tightened down firmly.
209RA011 VA
– With the chain brake activated (locked), open the throttle wide for a brief period (max. 3 seconds) – the chain must not rotate. : Remove the bumper strip (1). : Take out the screws (arrows). : Remove the cover (2).
209RA012 VA
209RA008 VA
– Start the engine.
: Carefully ease the brake spring off the anchor pin. – If the groove in the anchor pin is worn, install a new pin, b 5.7.1
18
MS 290, MS 310, MS 390
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– Lubricate all sliding and bearing points with STIHL multipurpose grease or, preferably, molybdenum grease (e.g. Molykote), b 13.
3
1 2
208RA004 VA
135RA032 VA
1 2
: Carefully pry the hand guard (1) and bell crank (2) off their pivot pins and remove them together.
: Fit the bushing (1) in the hand guard (2). : Insert M5x24 screw (3) and tighten it down firmly, b 3.5
– Pull the bell crank out of the hand guard.
Install all other parts in the reverse sequence.
4
– Check operation of chain brake, b 5.6.1
2
: Detach the spring (2). : Remove the E-clip (1). : Pull off the cam lever (3).
209RA018 VA
1
146RA202 VA
3
: Push the bell crank into the side of the hand guard. The short arm of the bell crank must point to the top of the hand guard.
– Inspect parts and replace if damaged.
1
– Clean the entire housing recess for the chain brake.
– If necessary, pull the bell crank out of the hand guard. Install in the reverse sequence.
20
2 209RA019 VA
: If the groove in the pin (4) (for spring) is worn, install a new pin, b 5.7.1
: Use assembly tool (2) 1117 890 0900 to attach the brake spring (1) to the anchor pin.
MS 290, MS 310, MS 390
5.7 5.7.1
Replacing Pins Removing
209RA185 VA
Brake spring anchor pin
209RA188 VA
Drive out the pin in the direction of the arrow so as not to damage the annular bead which was formed in the engine housing bore when the pin was originally installed. The new anchor pin will not otherwise fit properly and the brake spring will not be held securely.
209RA190 VA
If the groove of the anchor pin is worn, install a new pin.
Hand guard pivot pin
Cam lever pivot pin
– Remove the hand guard, b 5.6.2
– Remove the muffler, b 6.1
– Remove the cylinder, b 6.5.1
– Remove the handle housing, b 9.2
: Use a 4 mm drift to remove the pin by driving it outwards.
: Use a 4 mm drift to remove the pin by driving it outwards.
– Installing, b 5.7.2
– Installing, b 5.7.2
Spring anchor pin
Lever pivot pin
– Remove the muffler, b 6.1
– Remove the muffler, b 6.1
– Remove the handle housing, b 9.2
– Remove the handle housing, b 9.2
– Disconnect the brake spring, b 5.6.2 – Remove the cylinder, b 6.5.1 : Use a 4 mm drift to remove the pin by driving it outwards. If the pin cannot be seen on the inside of the housing, use a suitable tool to expose it.
MS 290, MS 310, MS 390
209RA191 VA
209RA189 VA
– Installing, b 5.7.2
: Use a 2 mm drift to remove the pin by driving it outwards.
: Use a 4 mm drift to remove the pin by driving it outwards.
– Installing, b 5.7.2
– Installing, b 5.7.2
21